Purpose
Acquire RED and BLUE data in a 9-position dither pattern.
This is similar to the box9 pattern, but each point (except
the first, taken at the origin) is shifted such that the
center will never be in the same column or row.
Usage
bxy9_skew_br [x [y [n_start]]]
Arguments
x = width of dither pattern in column direction
[arcsec; default=1]
y = width of dither pattern in row direction
[arcsec; default=1]
n_start = starting position [default=1]
Output
Restrictions
Exit values
0 = normal completion
1 = wrong number of arguments
Example
1) Acquire data in a 20x20 arcsec dither pattern
bxy9_skew_br 20 20
1) Acquire data in a 20x20 arcsec dither pattern, starting
from position 7
bxy9_skew_br 20 20 7